avista’s flexibility overview james gall senior power supply analyst contact:...
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Avista’s Flexibility Overview
James Gall
Senior Power Supply Analyst
Contact:
509.495.2189
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Overview
System & Resource Overview
Off system sales
Palouse Wind
IRP Planning
Future Studies
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2,764 megawatts, 54 turbines Two cascading hydro systems, 8 dams Multiple 3rd party sales and purchases contracts
Avista Balancing Authority
Resource Mix (megawatts)
Biomass 47 MW
Coal 222 MW
Hydroelectricity 1,162 MW
Natural Gas 858 MW
Wind 140 MW
Other Contracts 335 MW
Flexible Resource Overview
Hydro: Noxon Rapids: AGC, load following, contingency reserves Cabinet Gorge: load following, contingency reserves Long Lake: load following, contingency reserves
Thermal Coyote Springs 2: load following, AGC capable Colstrip: load following Northeast: supplemental reserves Rathdrum CT: supplemental reserves
Contracts Mid-Columbia: AGC, contingency reserves
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Dynamic Capacity Sales
First in nation market based rate authority for Ancillary Services Sales (Tariff 9)
Current Sales Provide Dynamic Capacity (imbalance services) to local
PUD and aluminum rolling mill- 3rd Party Schedule hourly product, Avista serves within
hour variation 5 MW dynamic sale and spin reserves to neighboring control
area Iberdrola imbalance market
Past Sales Up to 21 MW up and 20 MW down for 41 MW range Up to 50 MW up and 50 MW down for 100 MW range
Palouse Wind
Background
Developed by First Wind, owned by Palouse Wind LLC
30-year Purchase Power Agreement
Began Commercial Operation in December 13, 2012
105 MW (58- 1.8 Vestas V100 turbines)
Connected to Avista’s 230 kV Benewah-to-Shawnee Transmission Line
Expected capacity factor of 40 percent
Added to Avista’s portfolio to meet Washington State’s Energy Independence Act
Flexibility Implications
Contractual rights to curtail wind output with a cost
Limit ramp ups to 10 MW per minute
Typically hold 10 MW of capacity for wind following, during high winds hold 40 MW
and depend on operating reserves for high speed cutouts
Palouse Wind Output April 7th, 2013
0
10
20
30
40
50
60
70
80
90
100
7:1
2 A
M
9:3
6 A
M
12
:00
PM
2:2
4 P
M
4:4
8 P
M
7:1
2 P
M
9:3
6 P
M
12
:00
AM
Me
ga
wa
tts
How Avista Met April 7th Palouse Wind Variation
0
100
200
300
400
500
600
7007:
12 A
M
9:36
AM
12:0
0 P
M
2:24
PM
4:48
PM
7:12
PM
9:36
PM
12:0
0 A
M
2:24
AM
Me
ga
wa
tts
Clark Fork River Avista Total MW
Palouse Wind MW
IRP Planning
Avista Wind Integration Study (2007)
2013 IRP Capacity Planning
Long-term L&R balance accounts for operating reserves, regulation, and load and wind following needs
Add integration costs for variable renewable options (wind/solar)
Add integration benefits for certain resources (CTs, batteries, hydro)
Wind LocationsWind
CapacitySystem
PenetrationForecast
Error
Base Mrkt Price
Forecast ($/MWh)
Low Mrkt Price
Forecast ($/MWh)
High Mrkt Price
Forecast ($/MWh)
Columbia Basin 100 5% 15% 2.75 1.32 2.9950/50 Mix of CB & MT 200 10% 10% 6.99 2.67 8.53Diversified Mix 400 20% 8% 6.65 3.88 7.54Diversified Mix 600 30% 8% 8.84 3.98 10.45
Future Studies
Avista is developing operations model to optimize generation for day ahead and real-time dispatch, the model will help traders with decision making.
The model will suggest how to optimize generating units to hold reserves, set dispatch levels, make day ahead commitment decisions, and market transactions.
Patent pending hydro algorithms are used to real-time dispatch hydro facilities based on unit level engineering level representation, including operating constraints.
The model can also be used for resource planning, such as wind/solar integration costs and valuation of flexible resources (battery/LMS100).